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Dear STW hive mind, I have transistor solder legs poking through a hole, but the connecting part of the board is the other side of the legs with no access.
Being a numpty I am trying to wick solder down through hole( does not work) or tin the legs and then heat them up from underneath hoping they take( does not work)
It’s a Peugeot partner heater circuit board that’s taken 6 hours of my time and a trip to breakers yard.
Any suggestions other than stop throwing money at the old girl? 172K.
So though hole component but no access to pads? Is there no way to get access? What is stopping you? Even if you have to desoilder a daughter board or component it may be worth it to achieve a good connection
You could try dripping liquid flux down the legs / holes before applying heat and solder.
You can apply a reasonable amount of heat to the legs if you put a heatsink at the top (clamp the leg with needle nose pliers or similar).
To be honest your description of what you're trying to do isn't very clear.
Conductive glue?
I don't see how that could ever work. If it is a through hole transistor and you can't get the the through bit of the hole, there is no way to make sure your solder or glue is joining the Pin to the conductive trace, and not bridging two adjacent traces or pins. I think you are going to have to find a way to get at the back somehow.
Able to turn the legs up back on themselves under the board and sort of act as hook/ solder collector? Then just loads solder through top side.
Edit - or have them at an angle so go through the board touching 2 side/ almost blocking it so sodler gathers in and just through hole onto pads? Hope that makes sense?
Do you have a layout of the board, for example, a photo of the tracked side? Either the one you're working on or another? If so, could you find the components each track leads to, and solder a wire to the relevant leg on the top side of the board - then all you have to do is solder the wires to the transistor legs.
^that's a good idea. Will take a bit odd f buzzing out though.
If the PCB was assembled into the housing, then you must be able to unassemble it. After all, by the looks of the effort that you have made so far, a little bit more to do the job properly must be worth it - Shirley?
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Greybeard what a good idea -tried it.
Then went to my excellent motor parts shop and with a bit of free advice ordered the whole flipping thing for £14! Muppety Muppet.